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I am having problem #4. I use MacPro 6.1 and after updating to 10.10.3 and installing nVidia drivers my monitors says no signal. I tried to use your guide but I was not able to located <key>ConfigMap</key>.
What am I doing wrong? here is a screenshot of my Info.plist for AppleGraphicsControl.kext

Moderator

I am having problem #4. I use MacPro 6.1 and after updating to 10.10.3 and installing nVidia drivers my monitors says no signal. I tried to use your guide but I was not able to located <key>ConfigMap</key>.
What am I doing wrong? here is a screenshot of my Info.plist for AppleGraphicsControl.kextView attachment 137035

You need to dig deeper to find the right info.plist. Once you have shown the package contents of /System/Library/Extentions/AppleGraphicsControl.kext you then need to keep going to /Contents/PlugIns/AppleGraphicsDevicePolicy.kext/Contents/info.plist.

Boot process goes like this (with GT 740 card installed): Press power on button; normal boot up to and through the TonyMac screen, Apple logo shows on white screen with progress bar, which makes it about 1/3 complete, then screen goes black, video shuts down, video comes back up, black screen with active progress bar, progress completes, then screen goes white. Cursor is frozen, keyboard is frozen. Then I press the Restart button, screen goes black, then white, then I finally get the desktop.

Using "Shutdown" in Mac OS X kills video (black screen), but the computer power never goes off until I press and hold the Power button on the computer.

The above varies; sometimes even restarting after the screen goes white (above) results again in a white screen. But at least half the time, the desktop comes up and computer operates normally (until shutdown).

More suggestions? Please note that I have already once used my Unibeast USB stick and using Disk Utility, with the GT 740 not installed, re-partitioned my "Yosemite" SSD, made a fresh install of Yosemite 10.10.3, ran Multibeast with no "Graphics Enabler" or "IGFX" flags, and everything worked perfectly with no GT 740 card. Adding the card (whether or not setting up the BIOS for the card, as I wrote in my original post) causes the booting and shutdown screw-ups.

You need to dig deeper to find the right info.plist. Once you have shown the package contents of /System/Library/Extentions/AppleGraphicsControl.kext you then need to keep going to /Contents/PlugIns/AppleGraphicsDevicePolicy.kext/Contents/info.plist.

Spend a little more time than usually but all works now just fine now. Used solution for problem #4 but it didn't helped right away. Rebuild kernel cache, fixed disk permissions and reinstalled nVidia drivers. Reboot and I'm back in business on 10.10.3 )
Thank you for the guide.

Moderator

Spend a little more time than usually but all works now just fine now. Used solution for problem #4 but it didn't helped right away. Rebuild kernel cache, fixed disk permissions and reinstalled nVidia drivers. Reboot and I'm back in business on 10.10.3 )
Thank you for the guide.

Thank you very much! This post helped me solve my no monitor signal issue after updating to 10.10.3 and re-enabling the Nvidia Web Drivers. I just wanted to point out a misspelling here, it's "Extensions" instead of "Extentions".